JPH0339399Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial field of application] This invention is a synthetic resin bag that is adsorbed into the opening of a container such as a bag so as to close the opening, and is used for taking in and out of the container. This invention relates to a synthetic resin spout.

[Prior Art] This type of synthetic resin spout has been developed to be convenient for taking out and taking out contents inside and resealing the container when the container is made of a relatively flexible material such as a synthetic resin sheet. There is. Such synthetic resin spouts generally have a spout, a boat-shaped flange with a peripheral wall attached to the opening of the container, and a connecting part that connects these parts by integral molding of synthetic resin. has been done.

[Problem to be solved by the invention] In the above-mentioned spout, the opening of the container and the peripheral wall of the flange part are thermally fused by pressing the inner surface of the opening against the outer surface of the peripheral wall with a jig while heating. It is attached by wearing it. At this time, even if the wall thickness of the boat-shaped peripheral wall was set to be considerably large, there was a problem that the softened peripheral wall would locally recess inward, resulting in incomplete fusion at this location. For this reason, conventionally, a plurality of reinforcing ribs are provided inside the peripheral wall to prevent the peripheral wall from denting. However, with such a structure, the reinforcing ribs are provided, which deforms the overall shape of the ship, and especially distortion occurs at the joints of the ribs, which is inconvenient when the initial shape is obtained or welded. .

[Means for Solving the Problem] The synthetic resin spout of this invention has a cylindrical spout and a circumferential wall at one end of the spout that protrudes in opposite directions, and both side surfaces are connected to the inner surface of the opening of the container. a pair of solid flanges to be attached;
Both side surfaces of each flange portion are located between a flat surface that extends substantially parallel toward the tip so that the flange portion has a constant thickness, and the peripheral wall of the spout and this flat surface. The flange portion is formed so as to become thicker toward the outlet, and is characterized by having a curvature surface that curves inward.

[Function] In the synthetic resin spout of this invention, one end of the spout is inserted into the container and heated and pressed from the outside of the container, so that the spout is able to close the container with the peripheral wall on the one end side and the side surface of the flange. is fused to.

[Example] A synthetic resin spout according to an example of this invention will be described below with reference to the accompanying drawings.

In FIGS. 1 and 2, reference numeral 1 indicates a cylindrical spout, and solid flanges 2, 2 are provided on the circumferential wall of one end of the spout so as to protrude in opposite directions. Although not shown, a male thread is preferably formed on the outer periphery of the other end of the spout 1, and the spout 1 is closed by screwing the cap onto this male thread. Each flange portion 2 has a base end portion 2a.
, an intermediate portion 2b, and a tip portion 2c. The base end portion 2a is integrally formed between the intermediate portion 2b and the circumferential wall of the spout 1, and is connected from the spout 1 to the intermediate portion 2.
It has a curvature surface that curves inward so that it becomes gradually thinner as it goes toward b. Both surfaces of the intermediate portion 2b are made of flat surfaces extending parallel to each other so as to have a constant thickness. This intermediate portion 2b is formed quite thinly, and the thickness is preferably 2 mm or less. Both surfaces of the tip 2c are tapered so as to intersect with each other at the tip. This tapered surface may be flat or curved. Although not shown, a protrusion is formed on the circumferential surface of the flange portion, extending almost all the way around, so that the circumferential surface may have some unevenness when it is heat-sealed to the inner surface of the container. Alternatively, reliable fusion may be achieved over the entire circumference. In addition, the spout 1 with the above configuration
and the flange portions 2, 2 are integrally formed of thermoplastic resin such as polyethylene or polypropylene.

In the synthetic resin spout having the above configuration, the flange portions 2, 2 are formed solidly, and the intermediate portion 2b, which occupies most of the flanges, is formed thin and flat. Therefore, during fusion by heating, almost no flesh shrinkage occurs in this part. In addition, the base end portion 2a formed between the intermediate portion 2b and the spout is
Since it gradually becomes thicker toward the spout 1 and curves inward, almost no flesh shrinkage occurs in this portion as well. In addition, when the proximal end part 2a does not have a curvature surface as described above and has a uniform thickness like the intermediate part 2b, at the joint between the flange part and the peripheral wall of the spout, There is a drawback that the sealing in this part is incomplete. In addition, the base end 2a
If it is formed with a flat surface or a curved surface that protrudes outward, it is almost impossible to prevent the occurrence of flesh shrinkage.

Next, the specific shape of the flange portion 2 will be explained with reference to FIGS. 3 and 4.

As shown in Figure 3, the horizontal axis is Y and the vertical axis is X,
Centering on the intersection point, draw a circle c that is the outer periphery of the spout and has a diameter of a+2 mm or larger. Next, straight lines 1, 1 parallel to each other are drawn at equal intervals along the horizontal axis Y, and their intersections with the circle c are defined as m, m. The straight lines 1, 1 define both sides of the intermediate portion 2b, and therefore, the distance between these straight lines 1, 1 is the thickness a of the intermediate portion 2b. At this time, the middle part 2b
Set the thickness to 0.5mm to 2mm. If the thickness is 2 mm or more, as shown in FIG. 4, shrinkage will occur at the intermediate portion 2b. In FIG. 4, the vertical axis indicates the degree of thinning, the horizontal axis indicates the thickness a of the intermediate portion 2b, and 0 on the vertical axis indicates a state where no thinning has occurred. Furthermore, if the thickness is set to 0.5 mm or less, the entire portion may soften during heat fusion, leading to a change in shape.

Next, a circle d of radius r is taken with each point m as the center. The radius r (mm) of the circle d at this time is set as follows.

r≦(3.5-a)/2 Then, take a circle e that is in contact with the circle c, the circle d, and the straight line 1. This circle e is set to the curvature of the curvature surface of the base end portion 2a. Base end part 2 set in this way
As a result of the experiment, a did not cause meat shrinkage.

The shape of the tip 2c may be arbitrary, but the angle Θ is 45
It is preferable to set it so that it is below 100°C.

Although the outer surface of the proximal end of the flange portion is a partially circular surface in the above embodiment, it is not limited to this, and may be an ellipsoid or a paraboloid as long as it is a curved surface that projects inward. good.

[Effects of the Invention] In the synthetic resin spout of this invention, flesh shrinkage does not occur even without forming special members such as reinforcing ribs, so the initial shape can be easily secured when molding this synthetic resin spout. This has the effect of allowing complete fusion and simplifying the mold structure.

[Brief explanation of drawings]

1 and 2 show a synthetic resin spout according to an embodiment of this invention, FIG. 1 is a partially cutaway side view, FIG. 2 is a plan view, and FIGS. 3 and 4 are: These are diagrams for explaining a specific example of the shape of a synthetic resin spout. FIG. 3 is an explanatory diagram thereof, and FIG. 4 is a diagram showing the relationship between thickness a of the intermediate portion 2b and meat shrinkage through an experiment. be. DESCRIPTION OF SYMBOLS 1... Outlet, 2... Flange part, 2a... Base end part, 2b... Middle part, 2c... Tip part.

Claims (1)

[Claims for Utility Model Registration] 1. A cylindrical spout and a pair of solid pieces that protrude in opposite directions from the circumferential wall of one end of the spout and have both sides attached to the inner surface of the opening of the container. a flange portion, and both side surfaces of each flange portion include a flat surface that extends substantially parallel toward the tip so that the flange portion has a constant thickness, and a peripheral wall of the spout and the flat surface. 1. A synthetic resin spout, which is located between the spout and the spout, and has a flange portion that becomes thicker toward the spout, and a curvature surface that curves inward. 2 The flange portion has a distance a between the flat surfaces set to 0.5 to 2.0 mm, and the outer peripheral surface of the spout is set to a circular shape with a diameter of a+2 mm or more, and the flange portion The curvature of the curvature surface is defined by a circle whose center is the point where the extension line of the flat surface intersects with the peripheral wall of the spout and whose radius is (3.5-a)/2 mm or smaller, the flat surface, and the peripheral wall. 2. The synthetic resin spout according to claim 1, wherein the synthetic resin spout is defined by a circle that is in contact with three parts.